/**
* Copyright (C) 2013-2024 Nanjing Pengyun Network Technology Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ 

package py.randomsequential;

public class RandomSequentialIdentifierImpl implements RandomSequentialIdentifier {
  private final IoStateMachine ioStateMachine;

  public RandomSequentialIdentifierImpl(int sequentialConditionThreshold,
      int randomConditionThreshold) {
    ioStateMachine = new IoStateMachine(sequentialConditionThreshold, randomConditionThreshold);
  }

  @Override
  public synchronized boolean updateLastOffsetAndIsSequential(long offset, int length) {
    IoStateMachine.State state = ioStateMachine.process(offset, length);

    if (state == IoStateMachine.State.IO_RANDOM) {
      return false;
    } else {
      return true;
    }
  }

}
